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Sorry, I got interupted. The rtlsdr work with computer, are low cost ($5-$25) and with suitable freeware and low cost software, can decode many devices. For example, the program rtl_433 is used with many weather stations to decide the weather data and send it to the internet. By the way, the right rtlsdr covers 24 mh z to 1700 mhz. Although it doesn't have the best sensitivity, such a device is unusual.

It's rtl2832u. It's a European dab tv tuner that had a troubleshooting mode built in it that could be modified for a bunch of other things. The current best tuner is the r820t2. Try rtl-sdr.com for more info and a blog.